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Preparation method of nickel titanium foam alloy with double pore structure

A foamed alloy and dual-porosity technology, applied in the field of nickel-titanium foamed alloy preparation, can solve the problems of low pore connectivity, uneven pore distribution, etc., and achieve smooth and rounded pore walls, uniform and controllable composition and structure, and good damping performance. Effect

Inactive Publication Date: 2012-12-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of low pore connectivity and uneven distribution of pores in the existing nickel-titanium foam alloys used for bone tissue replacement and repair. The present invention provides a method for preparing nickel-titanium foam alloys with double pore structure

Method used

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  • Preparation method of nickel titanium foam alloy with double pore structure
  • Preparation method of nickel titanium foam alloy with double pore structure
  • Preparation method of nickel titanium foam alloy with double pore structure

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specific Embodiment approach 1

[0055] Specific embodiment one: this embodiment is the preparation method of the nickel-titanium foam alloy of double pore structure, and it is realized through the following steps:

[0056] 1. Weigh the alloy raw material and sodium chloride filling, and control the quality of the sodium chloride filling to be 19% to 25% of the total mass of the alloy raw material and sodium chloride filling, and the alloy raw material is 55% to 56% by mass Nickel powder and 44% to 45% titanium powder, the sodium chloride filling is composed of 60% to 80% large particle sodium chloride and 20% to 40% small particle sodium chloride by mass percentage, large particle Sodium chloride and small particle sodium chloride are weighed separately, and then the alloy raw material and small particle sodium chloride are mixed to obtain mixed powder, and the height after the large particle sodium chloride and the mixed powder are controlled to spread evenly to the mold is 0.5 ~ 2mm, and the obtained One p...

specific Embodiment approach 2

[0065] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 3, 20 to 200 parts of mixed powder obtained in step 2 and large-grained sodium chloride are sequentially laminated and evenly spread into the mold, and a powder spreading device is used complete, combine figure 1 Instructions The powder spreading device of this embodiment is composed of a mold base 1, a mold cylinder 2, an extension pipe 3 and a stirring rod 4. The stirring rod 4 has multiple sets of stirring blades 4-1, and one end of the mold cylinder 2 is sealed. On the flange of the mold base 1, the other end of the mold cylinder 2 is in sealing communication with one end of the extension pipe 3, and the stirring rod 4 is inserted from the other end of the extension pipe 3, so that the working end of the stirring rod 4 is inserted into the end of the extension pipe 3. One port. Other steps and parameters are the same as those in Embodiment 1.

[0066] In this em...

specific Embodiment approach 3

[0067] Embodiment 3: This embodiment differs from Embodiment 2 in that the height h of the extension tube in the powder spreading device is 2 to 4 times the height H of the mold cylinder. Other steps and parameters are the same as in the second embodiment.

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Abstract

A preparation method of a nickel titanium foam alloy with a double pore structure relates to a preparation method of a nickel titanium foam alloy. The invention solves the problems that the existing nickel titanium foam alloy used for the replacement and repair of the bone tissue has low pore interconnectivity and uneven pore distribution. The method comprises the following steps: respectively weighting several parts of nickel powder, titanium powder, large-particle sodium chloride and small-particle sodium chloride, evenly spreading large-particle sodium chloride and the mixed powder of nickel powder, titanium powder and small-particle sodium chloride in a mould in a laminated mode successively, and then performing cold compressing and forming, cold isostatic pressing, hot pressing sintering and homogenizing treatment in turn. The porosity of the nickel titanium foam alloy is 59.17%-71.71%; and the elastic modulus of the alloy is effectively reduced, which is close to the modulus of the bone tissue. The pore distribution is uniform, and small pores are distributed around large pores to ensure that the large pores are connected to form interconnected pores. By adopting the nickel titanium foam alloy, the bone tissue is controlled to only grow in the large pores; and the nickel titanium foam alloy can be used as the material used for the replacement and repair of the bone tissue.

Description

technical field [0001] The invention relates to a preparation method of a nickel-titanium foam alloy. Background technique [0002] The size and distribution of pores in NiTi foam determine its mechanical, physical and biological properties. At present, metal foam materials, including nickel-titanium foam alloys, generally can only obtain foam alloys with one pore size through powder metallurgy or infiltration methods, and the pore distribution is not controlled. This foam alloy containing only one pore size often results in thick nodes and uneven pore edges, which cannot optimize the performance of the foam material; be affected. [0003] Foamed nickel-titanium shape memory alloy has a good application prospect in the field of biomaterials due to its special shape memory effect, superelasticity and good biocompatibility. Its foam structure expands the contact area between materials and biological tissues, which is beneficial to implant Reliable fixation of objects; the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C19/03
Inventor 张学习侯皓文陈志旋魏文庭魏陇沙耿林
Owner HARBIN INST OF TECH
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